Regulation of Human Heart Rate
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1 Name: Date: Period: Regulation of Human Heart Rate Pre-Lab 1. List some activities or stimuli that you think may increase a person s heart rate. An activity is something a person does, and a stimulus is an input from the environment around a person. 2. Why would it be useful for the heart to beat faster during these activities or in response to these stimuli? 3. Are there any activities or stimuli that you think may decrease a person s heart rate? Introduction Today, after you learn how to measure heart rate accurately, your group will design an experiment to test how a stimulus or activity affects heart rate. During the next laboratory period, you will carry out your experiment and analyze your data. Measuring Heart Rate Accurately Each time the heart beats, blood is pumped into the arteries. As the blood surges into the arteries during a heartbeat, each artery stretches and bulges. This brief bulge of the artery is called a pulse. To measure heart rate you will count the number of pulses in the artery in the wrist in a 30 second interval. To feel pulse, find the artery in your partner s wrist. Place the tips of the first two fingers of one hand on the palm side of your partner s wrist, over toward the thumb side of his or her wrist. You may need to press quite firmly in order to feel the pulse of blood which each heart beat sends through the artery. Don t use your thumb to feel the pulse in the wrist, because your thumb has a pulse of its own. Practice counting the number of pulses in 30 seconds. Multiply that number by 2 to get heart rate (number of beats per minute).
2 After you have practiced, it is important to check the accuracy of your heart rate measurements. Work in a group of four using the following procedure to test and improve the accuracy of heart rate measurements. 1. Choose one person in your group to be the subject, one person to measure the pulse count in the left arm, and one person to measure the pulse count in the right arm. The fourth person in the group will use the stop watch to time a 30 second interval, and will indicate when the count of beats should begin and end. 2. Both people who are measuring pulse count should write down the number of beats for the 30 second interval before saying the number out loud. Pulse count in 30 seconds: Next, compare the results found by the two different people who were measuring pulse counts. Did you both count about the same number of pulses in the 30 second interval? If you got different results, can you figure out why? 3. Try to improve your technique, and repeat step 2 until both people who are measuring pulse counts get the same number of pulses in the 30 second interval (or within 1 or 2 of the same number). 4. Once you have accurate readings, use the final, accurate set of measurements to calculate the heart rate for this subject (beats per minute). Heart rate= beats per minute 5. After this, you should switch roles. The people who are measuring pulse counts should now be the subject and the timer, and the people who were the subject and the timer should now measure pulse counts. Repeat steps 2-3 until the heart rate measurements are accurate. Designing Your Experiment Discuss how you could test your ideas concerning activities or stimuli which may increase or decrease heart rate. Choose a hypothesis that your group would like to test in your next lab class. Write your hypothesis here. Plan Your Experimental Procedure Try to keep everything constant, except for the one stimulus or activity you want to test. This will allow you to measure the effect of the stimulus or activity you are testing, and minimize the confounding effects due to any other factors that may influence heart rate. For example, unless you are measuring the effects of physical activity try to avoid any physical activity that could influence your results (ex. changing seats or change in posture).
3 Plan to have each person in the group be a subject in the experiment, in order to see whether different people have the same heart rate responses to your stimulus activity. In the space on the next page, fill out the parameters for your experiment. Be specific about what you plan to do to your subjects (the stimulus) or what you want your subjects to do (the activity). Specify when and how often you will measure heart rate; you will need to measure resting heart rate two or three times before your stimulus or activity, and you will need to measure heart rate during and/or after your stimulus or activity. Your teacher will check your plan for your experiment, and make any suggestions that could improve the experimental procedure. Discuss these suggestions and, if you decide to make changes in your experimental procedure, incorporate these changes in your description of your procedure. Getting Ready to Do the Experiment If you need to bring anything to do your experiment next time, decide who will bring the necessary materials or equipment. Doing Your Heart Rate Experiment Review your experimental plan and carry out the experiment for each subject in your group. Record your data in the space provided. Analyzing Your Results Discuss the best way to analyze your data in order to test your hypothesis. You may want to use one of the following methods of analysis. 1. For each subject, calculate the change in heart rate (the difference between a resting heart rate and the heart rate during/after the stimulus or activity). Calculate the average change in heart rate for all subjects in the experiment. Make a table to show the individual values and the average change in heart rate. 2. For each subject, graph the resting heart rate and the heart rate during and/or after the stimulus or activity. Calculate the average resting heart rate and the average hear rate during and/or after the stimulus or activity. Graph these averages. Be sure to label both axes of any graph that you make. Each student should analyze the data and attach your table or graphs. Do your results support your hypothesis? What conclusion can you draw from your experiment? Fill in the conclusion in the space provided.
4 Hypothesis Materials Variables: Independent: Dependent: Procedure Data -Observations -Collection
5 Analysis Conclusion
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